4. Suppose the risk-free rate is 3%. And the market interest rate is 5%. There are two stocks A and B. Both pay annual dividend per share of $2 and $3, respectively. The correlations (denoted as corr(x,y)) between their returns and the market return are corr(r1,5m) = 0.2 and corr(r2, rm) = 0.7, respectively. The standard deviations (denoted as o) of their returns and the market return are 01=0.4,0 2=0.6, and a m=0.3, respectively. (20 scores) (Note: The x and y above are two arbitrary random variables representing time series of returns.) a. What are the returns (r and r) for these two stocks from CAPM? (Hint: when you are computing beta, be aware that Cov(x,y)= corr(x,y)*ox* Oy, Cov denotes covariance here.) b. What are the prices of these two stocks if the dividend is not growing? C. What are the Sharp ratios for these stocks and the market portfolio? d. If 30% of my portfolio is stock A, the rest of it is stock B. What is the variance of my portfolio if E (r1 * 12) = 0.2? (Hint: Cov(x,y) = E(x*y) - E(X)*E(y))